Safety; General Safety Warnings; Recommendations; Specifi C Safety Instructions - Heatrae Sadia HI-MAX INSTANT ID 5-60 Installation, Operation And Maintenance Manual

2.1 General safety warnings

DANGER
This unit becomes pressurised when in
operation. The combination of pressurisation
and hot water could lead to serious physical
injury if the safety instructions in this manual
are not adhered to.
The unit is also designed to work at district
heating hydraulic pressures up to 10 bar g and
temperatures up to 90
could lead to serious physical injury.
WARNING

Only
received the appropriate training are
permitted to work on the appliance
and the installation.

Do not tamper with any of the safety
valves or controls supplied with the
unit.

Before any work, isolate the mains
electrical supply to the appliance.
WARNING

Do not adjust the safety tempering
valve (Stv). This is factory set to prevent
excessive hot water temperatures
reaching the taps in the event of
a system failure (see fi gure 1). The
purpose of this valve should not be
confused with that of a point of use
mixing valve which is fi tted near to the
tap to prevent scalding.

Do not tamper with any of the safety
valves fi tted to the system. If a fault
is suspected contact a competent
installer (see fi gure 1).

2.2 Recommendations

WARNING
When handling the unit, take appropriate
precautions for the weight and stability of the
unit. Weights can be found in section 3, p6.
CAUTION
Annual maintenance must be carried out
by a competent person. Failure to do so will
invalidate the warranty
4

2. Safety

O C, which, if exposed to
competent persons
Figure 1: HIU Safety Valves
Safety Tempering Valve (Stv)
2.3 Specifi c safety instructions
having
WARNING

Under no circumstances should the
factory fi tted safety valves (Stv and Prv)
be removed by anyone other than a
competent person. The unit must not
be run if either of these safety valves
have been removed. Doing so will
invalidate any guarantee or claim.

Although the unit is suitable for cold
water pressures up to 10 bar g it is
strongly recommended that pressures
above 3 bar g are reduced down using
a suitable PRV fi tted in the cold feed
pipework.

Where water hammer may be an issue
fi t a suitably sized potable water shock
arrester / expansion vessel.

Although the water regulations allow
potable water expansion from this
type of product to be accommodated
in cold water supply pipework, if there
is a back fl ow prevention device (eg.
check valve) fi tted in this pipework, a
potable water expansion vessel should
be fi tted to hold the expanded system
water volume (see Figures 17 and 18).

Where expansion vessels have been
fi tted, it is good practice to protect the
system in the event of its failure using a
suitable potable water safety valve.

No control or safety valves should be
tampered with or used for any other
purpose.

The Prv discharge pipe should not be
blocked or used for any other purpose.

Where a tundish is fi tted, this should not
be located adjacent to any electrical
components.
Heating Prv